Without a Doubt, the Coolest Planet Ever

It’s hard to imagine that at one time scientists were unsure whether planets even existed outside out solar system. Now, it seems like lately there is a new planet discovered every week – it’s almost become commonplace. But now the coolest planet of the bunch has been discovered just 340 light years from Earth orbiting the star HD 131399A.

What Makes This Planet Special?

The planet, HD 131399Ab, is the first one ever found that is in a star system with three stars. It had previously been thought that three stars would prohibit a planet from forming and maintaining a stable orbit. That theory has just been proven wrong. The video below shows how the planet and stars orbit, and is just amazing. It shows that the two smaller stars in the system orbit each other, and as a pair orbit the larger star. The planet also orbits the larger star, inside the…